The aim of this study was to evaluate the effect of the temporary restriction of balanced feed on the maximization of the economic benefits of fattening guinea pigs. In total, 100 male and female guinea pigs of the Red Line of 21 ± 3 days of age were used, distributed in 5 metallic cages of 4 levels and 5 animals per cage. The diets of feed restriction were: T1 (ad libitum), T2 (14 days + 50% ration), T3 (21 days + 50% ration), T4 (14 days + 25% ration) and T5 (21 days + 25% ration). The ad libitum ration consisted of 10 g/animal/day with increments of 4 g per week up to a maximum consumption of 66 g/animal/day. Green alfalfa was supplied in a proportion equivalent to 10% of body weight. By using body weights, weekly feed consumption and unit prices, growth functions (S), production (Q) and accumulated economic benefits (B) were established. The first partial derivative was applied to B...

En minería subterránea, la perforación se utiliza en los avances de los frentes de explotación, esta operación se realiza en húmedo para mantener la calidad del aire, minimizando el riesgo de enfermedades profesionales. La adición de agua, permite además el barrido del mineral molido, la refrigeración de las barras y el sellado de las paredes del tiro en terrenos fracturados, evitando el atascamiento de las barras de perforación. La voladura involucra el uso de explosivos y ello implica generalmente la emanación de CO2 y gas nitroso, mucho más con el uso convencional de explosivo de dinamita, en el trabajo de investigación que se presenta se evalúa los beneficios reemplazándolos por explosivos emulnor. El trabajo de investigación titulada “cambio de explosivo de dinamita convencional a emulnor para evaluar su rendimiento de voladura en la empresa minera Corimayo Servici...

The study was developed in Iquitos; District of Nativity passage "Paquito", place where medicinal plants, resins, and other species of healing properties are expended. The objective was to determine the current situation of the consumption and use of the oil of Copaiba with commercial ends in the city of Iquitos. The sample was represented by 30 people, the results of the survey were; 66,7% of those interviewed is of the feminine gender; 43,3% is convivences; 56,7% resides in the district of Iquitos; with respect to the stratum economic partner the 40 / they are of half condition; 63,3% has primary instruction; 26,7% knows the copaiba and the cat fingernail and 20% he/she knows the achiote like medicinal plant; 33,3% says that the copaiba oil cures the gastritis and you ulcerate them, 40% says that the demand of the oil is daily and 23,3% says that it is weekly and monthly; 70% says that...

The study aimed to characterize for genetic improvement purposes an ovine Hampshire flock located in the central coast of Peru. Genetic and phenotypic parameters were estimated for Birth Litter Size (TCN), Litter Weaning Weight (PCD), 2-Month Weaning Weight (PD), 5-Month Slaughter Weight (PB), and Body Weight Gain from Weaning to 5 Months Old (GPD5); and selection indices for lambs (I1 and I2) and ewes (I3) were developed using data collected between 2002 and 2004. Components of the variance and covariance were estimated using the Restricted Maximum Likelihood method (REML), under a mixed model that included sex, type of birth, season and year of birth as fixed effects, and sire as random effect. Phenotypic mean values estimated for body weight traits in lambs and productive and reproductive traits in ewes were similar to the breed standard reared under medium technology systems. The est...

The study aimed to characterize for genetic improvement purposes an ovine Hampshire flock located in the central coast of Peru. Genetic and phenotypic parameters were estimated for Birth Litter Size (TCN), Litter Weaning Weight (PCD), 2-Month Weaning Weight (PD), 5-Month Slaughter Weight (PB), and Body Weight Gain from Weaning to 5 Months Old (GPD5); and selection indices for lambs (I1 and I2) and ewes (I3) were developed using data collected between 2002 and 2004. Components of the variance and covariance were estimated using the Restricted Maximum Likelihood method (REML), under a mixed model that included sex, type of birth, season and year of birth as fixed effects, and sire as random effect. Phenotypic mean values estimated for body weight traits in lambs and productive and reproductive traits in ewes were similar to the breed standard reared under medium technology systems. The est...